Ingeteam INGECON SUN 1000TL U B360, Installation And Operation Manual

Page: 84 / 180

ABK2027IQE01_A - Installation and Operation Manual
10.3.2. Inverters without -TSGND card
DANGER
All the operations described below must always and without exception be performed following the five golden
rules.
Operations upstream of the DC switch (inverter side)
The motorized switch on the units opens both the positive pole and the negative pole in the PV array, leaving the
inverter completely isolated. Therefore, to perform any operation upstream from the switch, simply follow the steps
given in section
“20. Shutting down the unit” .
Operations downstream of the DC switch (PV Array side)
To perform operations downstream of the switch it is essential to ensure the grounding of the grounded pole in
the array through a rigid ground connection, so that the equipotentiality of this point cannot be affected by an
insulation fault in the PV array that results in the rupture of the grounding fuse.
The correct procedure is described below:
1. Check that there are no insulation faults in the PV array.
DANGER
The existence of an insulation fault in the non-grounded pole of the inverter can cause a short circuit by
grounding the grounded pole.
2. Put all the inverters connected to the same transformer winding in manual stop (see section “20.
Shutting down the unit” ) or remotely via communications. It is possible but not recommended to stop
them using the emergency push button, as this causes the main circuit breaker and the DC switch to trip,
which is not necessary for performing the operations described below.
3. Open all the string boxes or level 1 boxes connected to the inverter on which work is to be carried out.
4. Connect a provisional portable ground between the grounded pole of the PV array and the installation's
ground connection in the inverter on which work is to be carried out (it is possible to make this
connection on the unit's grounding plate). This connection must be made taking into account that there
may be voltage in the grounded pole that is being worked on, if there has been an insulation fault that
has caused the grounding fuse to blow.
5. Disconnect the unit that work is to be carried out on following the steps described in section “20.
Shutting down the unit” of the operating manual.
6. Remove the polycarbonate protection from the inverter and verify that there is not voltage in all the inputs
of the inverter that is going to be worked on downstream of the motorized switch.
7. Remove the fuse from the connection of the grounded poles for the inverters (FG.1) in the inverter that is
being worked on.
Once these steps have been completed it is safe to work on the inverter.
The steps to re-energize the inverters connected to the same transformer winding are listed below.
1. Insert the fuse from the connection of the grounded poles for the inverters (FG.1) in the inverter that is
being worked on.
2. Place the polycarbonate protections in the inverter that is being worked on and close the unit housing.
3. Disconnect the provisional portable ground between the grounded pole of the PV array and the
installation's ground connection in the inverter being worked on. This disconnection must be made taking
into account that there may be voltage in the grounded pole that is being worked on, if there has been an
insulation fault that has caused the grounding fuse to blow.
4. Close all the string boxes or level 1 boxes connected to the inverter on which work is being carried out.
5. Commission the inverter that is being worked on, following the instructions in section “18.
Commissioning” .
84
Connection of the PV array grounding kit [optional] Ingeteam